Isometric
and Axonometric Projections are fairly simple ways to approach
3D drawing. These can be used for sketches or to draw to a
predetermined scale. If a scale is used, every part of the
drawing can be measured with accuracy.

Unlike perspective drawing, lines in Isometric or Axonometric
drawings do not converge. In fact they only
go in 3 different directions. Vertical and 30 degrees left
and right in Isometric Projections, vertical and 45 degrees
left and right in Axonometric projections.

Often, Axonometric projections may appear to be distorted
but they are very useful to show as much as possible of, for
example, the inside of a room.

Although it is possible to quickly produce projection drawings
using a drawing table, parallel motion and either a 30 degrees
or 45 degrees angled set square, it can be even easier if
a grid is placed underneath the paper. Both Isometric and
Axonometric grid paper are available from art and design shops
or you can make your own using a drawing table or a CAD program.